Poor choice of wording perhaps, but your documentation notes this:
The WordPress post format to Tumblr post type mapping looks like this:
WordPress’s Standard, Aside, and Status post formats become Tumblr’s Text post type
WordPress’s Image post format becomes Tumblr’s Photo post type
WordPress’s Video post format becomes Tumblr’s Video post type
WordPress’s Audio post format becomes Tumblr’s Audio post type
WordPress’s Quote post format becomes Tumblr’s Quote post type
WordPress’s Link post format becomes Tumblr’s Link post type
WordPress’s Chat post format becomes Tumblr’s Chat post type
Is there a way to be able to push a Standard post in WordPress to Tumblr as Tumblr’s link post type (and preferably to set that as a default)?